Q&amp;P980CR钢电阻点焊工艺优化

刘全龙; 孔谅; 王敏; 雷鸣

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Q&P980CR钢电阻点焊工艺优化
Q&P980CR steel resistance spot welding process optimization
- 角色： First author 第一作者
- 机构：
  上海交通大学上海市激光制造与材料改性重点实验室
  高新船舶与深海开发装备协同创新中心
刘全龙
1 2 ，
- 机构：
  上海交通大学上海市激光制造与材料改性重点实验室
  高新船舶与深海开发装备协同创新中心
孔谅
1 2 ，
- 机构：
  上海交通大学上海市激光制造与材料改性重点实验室
  高新船舶与深海开发装备协同创新中心
王敏
1 2 ，
- 机构：
  宝钢研究院汽车用钢研究所宝山钢铁股份有限公司
雷鸣
3
2019年49卷第8期页码：23-28
DOI：

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刘全龙, 孔谅, 王敏, 等. Q&P980CR钢电阻点焊工艺优化[J]. 电焊机, 2019,49(8):23-28.

LIU Quanlong, KONG Liang, WANG Min, et al. Q&P980CR steel resistance spot welding process optimization[J]. 2019,49(8):23-28.
刘全龙, 孔谅, 王敏, 等. Q&P980CR钢电阻点焊工艺优化[J]. 电焊机, 2019,49(8):23-28. DOI：

LIU Quanlong, KONG Liang, WANG Min, et al. Q&P980CR steel resistance spot welding process optimization[J]. 2019,49(8):23-28. DOI：

摘要

研究了常规焊接工艺方法下Q&P980CR钢的电阻点焊,因Q&P980母材碳当量过高,焊后接头淬硬组织多,焊点塑性差,导致其焊点拉剪试验呈界面断裂。提出了附加后热电流脉冲的优化方案,基于SORPAS数值模拟研究后热脉冲焊接电流、焊接时间对点焊接头t_8/5段冷却速率的影响,确定了优化工艺参数。实验结果表明,附加后热电流脉冲提高了点焊接头的拉剪强度和正拉强度,接头失效模式由界面断裂转变为熔核剥离,说明后热电流脉冲有效降低了点焊接头冷速,提高了点焊接头韧性。

译

Abstract

In this paper,the resistance spot welding of Q&P980CR steel under conventional welding parameters is studied. Due to the high carbon equivalent of Q&P980 base metal,the joints contain much hardening structure and manifest poor plasticity,resulting in interface fracture in the tensile-shear tests. Thus,the optimization scheme with the additional postheat current pulse is put forward.Based on SORPAS numerical simulation,the influence of the postheat pulse welding current and welding time on the cooling rate of section-t_8/5 of the welding joints is studied,and the optimized welding parameters are determined. The experimental results show that the postheat current pulse increases the tensile-shear strength and cross-tension strength of the welding joints,and the failure mode of the joints changes from interface fracture to pullout fracture,indicating that the postheat current pulse effectively reduces the cooling rate and improves the toughness of the welding joints.

译

关键词

Q& P钢电阻点焊; 数值模拟; 工艺优化; 后热电流脉冲

译

Keywords

resistance spot welding of Q& P steel; numerical simulation; process optimization; postheat current pulse

译

摘要

研究了常规焊接工艺方法下Q,&,P980CR钢的电阻点焊,因Q,&,P980母材碳当量过高,焊后接头淬硬组织多,焊点塑性差,导致其焊点拉剪试验呈界面断裂。提出了附加后热电流脉冲的优化方案,基于SORPAS数值模拟研究后热脉冲焊接电流、焊接时间对点焊接头t,8/5,段冷却速率的影响,确定了优化工艺参数。实验结果表明,附加后热电流脉冲提高了点焊接头的拉剪强度和正拉强度,接头失效模式由界面断裂转变为熔核剥离,说明后热电流脉冲有效降低了点焊接头冷速,提高了点焊接头韧性。

Abstract

In this paper,the resistance spot welding of Q,&,P980CR steel under conventional welding parameters is studied. Due to the high carbon equivalent of Q,&,P980 base metal,the joints contain much hardening structure and manifest poor plasticity,resulting in interface fracture in the tensile-shear tests. Thus,the optimization scheme with the additional postheat current pulse is put forward.Based on SORPAS numerical simulation,the influence of the postheat pulse welding current and welding time on the cooling rate of section-t,8/5, of the welding joints is studied,and the optimized welding parameters are determined. The experimental results show that the postheat current pulse increases the tensile-shear strength and cross-tension strength of the welding joints,and the failure mode of the joints changes from interface fracture to pullout fracture,indicating that the postheat current pulse effectively reduces the cooling rate and improves the toughness of the welding joints.